Blood pipette



June 10,1930. o. ARNOLD 1,762,807

' BLOOD PIPETTE Filed Oct; 19 1928 lnvenl'orr @l kdk Patented June 10, 1

PATENT OFFICE" or'ro ARNOLD, or SGHMIEDEFELD, GERMANY I BLOOD PIPETTE Application filed October 19, 1928, Serial No 313,594, and in Germany September 25, 1928.

The chief feature of the blood pipette forming the subject-matter of the present invention is this that at its so-called belly or bulb at least one exterior flat portion is pro- 5 vided, by means of which the pipette is comparatively securely prevented from rolling along upon its support, and falling 'doWn' from the same. Simultaneously therewith the further advantage is attained that the 10 pipette when resting upon said fiat portion: is in a less oblique positionso that the liquid which has been sucked into it cannot easily flow out of it. I

preferably of such a shape that sharp corners or edges likely to render 'propercleaning of the interior of the pipette difficult are obvi-' The flat portion is, or the flat port-ions are,

pipette can be thoroughly cleaned and also the thoroughintermixing of the-liquid con i 2. A pipette having an oblong spherical so.

bulb and'a flat portionion the outer surface,

thereof, said portion being as arranged so as to render the pipette non-tilting, as set forth.

In testimony whereofI affix my-signature. V

, OTTO ARNOLD}, V

at-ed. This provides at the same time for .7 thorough intermixing of the contents of the blood pipette with the aid of the glass bead generally-provided inthe belly of the same; f

In order to render the graduated scale of p the pipette more easily readable, also to render easier its manipulation, the-graduated tion of the pipette are provided with an im bedded and burnt-in light-colored enamel.

The inventionis illustrated diagrammatically and by way of example in the accomso panying drawingin which Figure 1 is a plan 7 of a pipette designed according to this invention; Figure 2 is a side-view of the same,

scale and, preferably, also the saidflat por-;

and Figure 3 a transverse section through V the belly of the pipette.

In the drawing, a denotes thepipette, b its bellyor bulb, and c the flat portion mentioned in the introductory part of this speciification.

pipette from rolling along upon its support, whatever this may be, and from falling down pette, when being in its position of rest, viz, with its fiat belly portion at the bottom, is in a lessobliqueposition than otherwise, the liquid contents of the pipette cannot flow out so easily as otherwise. 0Z denotes the This fiat portion prevents the from it, so as to break. Besides, as the pi- 

